Home Postcodes by state SA 5493 Postcode 5493 5493 is the postcode for Yongala, SA. Localities with postcode 5493YongalaSA Postcode 5493 State or territory South Australia (SA) Localities 1 Council area Peterborough Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5491 · Postcode 5495